CS8415A-CS Cirrus Logic Inc, CS8415A-CS Datasheet - Page 16

• Manufacturer Part Number: CS8415A-CS
• Description: IC, DIGITAL AUDIO RECEIVER, SOIC-28
• Manufacturer: Cirrus Logic Inc

Specifications of CS8415A-CS

• Audio Control Type: Digital
• Control Interface: I2C, Serial
• Control / Process Application: AV & DVD Receivers, CD-R, Digital Mixing Consoles
• Supply Voltage Range: 2.85V To 5.5V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.6
An AES3 stream may be used in more than one
way to transmit 96 kHz sample rate data. One
method is to double the frame rate of the current
format. This results in a stereo signal with a sample
rate of 96 kHz, carried over a single twisted pair ca-
ble. An alternate method is implemented using the
2 sub-frames in a 48 kHz frame rate AES3 signal to
carry consecutive samples of a mono signal, result-
ing in a 96 kHz sample rate stream. This allows
older equipment, whose AES3 transmitters and re-
ceivers are not rated for 96 kHz frame rate opera-
tion, to handle 96 kHz sample rate information. In
this “mono mode”, 2 AES3 cables are needed for
stereo data transfer. The CS8415A offers mono
mode operation, controlled through the MMR con-
trol register bit.
16
RCBL
out
VLRCK
C, U
Output
RCBL and C output are only available in hardware mode.
RCBL goes high 2 frames after receipt of a Z pre-amble, and is high for 16 frames.
VLRCK is a virtual word clock, which may not exist, but is used to illustrate the CU timing.
VLRCK duty cycle is 50%. VLRCK frequency is always equal to the incoming frame rate.
If the serial audio output port is in master mode, VLRCK = OLRCK.
If the serial audio output port is in slave mode, then VLRCK needs to be externally created, if required.
C, U transitions are aligned within 1% of VLRCK period to VLRCK edges
Mono Mode Operation
Figure 9. AES3 Receiver Timing for C & U pin output data
±
The receiver mono mode effectively doubles Fs
compared to the input frame rate. The clock output
on the RMCK pin tracks Fs, and so is doubled in
frequency compared to stereo mode. The receiver
will run at a frame rate of Fs/2, and the serial audio
output port will run at Fs. Sub-frame A data will be
routed to both the left and right data fields on SD-
OUT. Similarly, sub-frame B data will be routed to
both the left and right data fields of the next word
clock cycle of SDOUT.
Using mono mode is only necessary if the serial au-
dio output port must run at 96 kHz. If the CS8415A
is kept in normal stereo mode, and receives AES3
data arranged in mono mode, then the serial audio
output port will run at 48 kHz, with left and right
data fields representing consecutive audio samples.
CS8415A
DS470PP3